649786 has 4 divisors (see below), whose sum is σ = 974682. Its totient is φ = 324892.

The previous prime is 649783. The next prime is 649787. The reversal of 649786 is 687946.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 540225 + 109561 = 735^2 + 331^2 .

It is a d-powerful number, because it can be written as 6³ + 4⁴ + 7⁶ + 9⁶ + 8 + 6³ .

It is not an unprimeable number, because it can be changed into a prime (649783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162445 + ... + 162448.

2⁶⁴⁹⁷⁸⁶ is an apocalyptic number.

649786 is a deficient number, since it is larger than the sum of its proper divisors (324896).

649786 is a wasteful number, since it uses less digits than its factorization.

649786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324895.

The product of its digits is 72576, while the sum is 40.

The square root of 649786 is about 806.0930467384. The cubic root of 649786 is about 86.6144030717.

The spelling of 649786 in words is "six hundred forty-nine thousand, seven hundred eighty-six".